The better question is whether there is even life else where to begin with. Intelligent life? Possibly yes, possibly no... but like said, the problem has to do with distance.
To explain it simply, the speed of light is the FASTEST, ULTIMATE speed that can possibly be achieved; nothing faster. The speed of light is approx. 186,000 miles a SECOND. This is a FAR distance to be traveled, especially in a second. Now, the closest STAR to the earth (other than our own of course) is approx. 4 light years away. 4 light years away does not sound like a very large number or distance; but it is quite large. There are (leap years can change this if you want to get technical, but it that only means that this distance will only be longer) 31,536,000 seconds in a year. Multiply that by 4 to figure out the seconds approx. in 4 years, and you get 126,144,000 seconds in four years. Multiplying the second in four years times the speed of light per second, will give you the miles between the earth and the CLOSEST star to the earth (this star doesn't even have planets... and the other closest ones are about 6+ light years or more, and even those closer ones do not have planets). So this gives you approx. (or I should say ATLEAST) 23,462,784,000,000 miles between the earth and our closest star, and this can be achieved in four years IF you could even travel the speed of light.
Now to understand, we still have "trouble" (not necessarily trouble, but you can consider it that) to get a single atomic particle (neutron, proton, or electrons) to reach the speed of light. This takes A LOT of power to do. Now consider how many of these elementary particles are in the human body, then in a space craft, and you find that you need A LOT of energy just to get to the speed of light. Just on the fact of energy, it would be quite phenomenol (sp?) for any intelligent "race" anywhere to achieve such. Once you figure out how to get that much energy though, you can have to figure out how you would construct such a "vehicle" and all the other aspects.